unlocking iPhone 4 O2?

hello folks hope alright! need little help! bought iphone 4 locked o2. can tell me how can factory unlocked via o2 ppl? know can remotely unlock iphones. if buy prepaid sim of o2 , call customer service sim in iphone 4 , ask them me? looking forward thanx

 

when buy new iphone, either comes factory unlocked or doesn't.

 

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